215563161 has 16 divisors (see below), whose sum is σ = 314117568. Its totient is φ = 130406400.

The previous prime is 215563157. The next prime is 215563193. The reversal of 215563161 is 161365512.

It is not a de Polignac number, because 215563161 - 2² = 215563157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215563121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13381 + ... + 24701.

It is an arithmetic number, because the mean of its divisors is an integer number (19632348).

Almost surely, 2^215563161 is an apocalyptic number.

It is an amenable number.

215563161 is a deficient number, since it is larger than the sum of its proper divisors (98554407).

215563161 is a wasteful number, since it uses less digits than its factorization.

215563161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11912.

The product of its digits is 5400, while the sum is 30.

The square root of 215563161 is about 14682.0693704941. The cubic root of 215563161 is about 599.5952464635.

The spelling of 215563161 in words is "two hundred fifteen million, five hundred sixty-three thousand, one hundred sixty-one".